foreach(x) System.out.println(z);
for(int z : x) System.out.println(z);
while( x.hasNext()) System.out.println( x.next());
for( int i=0; i< x.length; i++ ) System.out.println(x[i]);
第1题:
10. public class Bar { 11.static void foo(int...x) { 12. // insert code here 13. } 14. } Which two code fragments, inserted independently at line 12, will allow the class to compile?()
第2题:
10. interface Foo { int bar(); } 11. public class Sprite { 12. public int fubar( Foo foo) { return foo.bar(); } 13. public void testFoo() { 14. fubar( 15. // insert code here 16.); 17. } 18. } Which code, inserted at line 15, allows the class Sprite to compile?()
第3题:
10. class Nav{ 11. public enum Direction { NORTH, SOUTH, EAST, WEST } 12. } 13. public class Sprite{ 14. // insert code here 15. } Which code, inserted at line 14, allows the Sprite class to compile?()
第4题:
1. import java.io.*; 2. public class Foo implements Serializable { 3. public int x, y; 4. public Foo( int x, int y) { this.x = x; this.y = y; } 5. 6. private void writeObject( ObjectOutputStream s) 7. throws IOException { 8. s.writeInt(x); s.writeInt(y) 9. } 10. 11. private void readObject( ObjectInputStream s) 12. throws IOException, ClassNotFoundException { 13. 14. // insert code here 15. 16. } 17. } Which code, inserted at line 14, will allow this class to correctly serialize and deserialize?()
第5题:
10. interface Foo { 11. int bar(); 12. } 13. 14. public class Beta { 15. 16. class A implements Foo { 17. public int bar() { return 1; } 18. } 19. 20. public int fubar( Foo foo) { return foo.bar(); } 21. 22. public void testFoo() { 23. 24. class A implements Foo { 25. public int bar() { return 2; } 26. } 27. 28. System.out.println( fubar( new A())); 29. } 30. 31. public static void main( String[] argv) { 32. new Beta().testFoo(); 33. } 34. } Which three statements are true?()
第6题:
Given: 10. class One { 11. void foo() { } 12. } 13. class Two extends One { 14. //insert method here 15. } Which three methods, inserted individually at line 14, will correctly complete class Two?()
第7题:
Alpha a = x;
Foo f= (Delta)x;
Foo f= (Alpha)x;
Beta b = (Beta)(Alpha)x;
第8题:
int foo() { /* more code here */ }
void foo() { /* more code here */ }
public void foo() { /* more code here */ }
private void foo() { /* more code here */ }
protected void foo() { /* more code here */ }
第9题:
foreach(x)System.out.println(z);
for(intz:x)System.out.println(z);
while(x.hasNext())System.out.println(x.next());
for(inti=0;i
第10题:
Move the line 12 print statement into the foo() method.
Change line 7 to public synchronized void go() {.
Change the variable declaration on line 3 to private volatile int x;.
Wrap the code inside the foo() method with a synchronized( this ) block.
Wrap the for loop code inside the go() method with a synchronized block synchronized(this) { // for loop code here }.
第11题:
Point p = new Point();
Line.Point p = new Line.Point();
The Point class cannot be instatiated at line 15.
Line 1 = new Line() ; 1.Point p = new 1.Point();
第12题:
foreach(x) System.out.println(z);
for(int z : x) System.out.println(z);
while( x.hasNext()) System.out.println( x.next());
for( int i=0; i< x.length; i++ ) System.out.println(x[i]);
第13题:
10. class Line { 11. public static class Point { } 12. } 13. 14. class Triangle { 15. // insert code here 16. } Which code, inserted at line 15, creates an instance of the Point class defined in Line?()
第14题:
11. public class Counter { 12. public static void main(String[] args) { 13. int numArgs = /* insert code here */; 14. } 15. } and the command line: java Counter one fred 42 Which code, inserted at line 13, captures the number of arguments passed into the program?()
第15题:
10. public class Foo implements java.io.Serializable { 11. private int x; 12. public int getX() { return x; } 12.publicFoo(int x){this.x=x; } 13. private void writeObject( ObjectOutputStream s) 14. throws IOException { 15. // insert code here 16. } 17. } Which code fragment, inserted at line 15, will allow Foo objects to be correctly serialized and deserialized?()
第16题:
10. interface Foo {} 11. class Alpha implements Foo {} 12. class Beta extends Alpha {} 13. class Delta extends Beta { 14. public static void main( String[] args) { 15. Beta x = new Beta(); 16. // insert code here 17. } 18. } Which code, inserted at line 16, will cause a java.lang.ClassCastException?()
第17题:
10. class Line { 11. public class Point { public int x,y; } 12. public Point getPoint() { return new Point(); } 13. } 14. class Triangle { 15. public Triangle() { 16. // insert code here 17. } 18. } Which code, inserted at line 16, correctly retrieves a local instance of a Point object?()
第18题:
public void foo() { /* more code here */ }
private void foo() { /* more code here */ }
protected void foo() { /* more code here */ }
int foo() { /* more code here */ }
void foo() { /* more code here */ }
第19题:
args.count
args.length
args.count()
args.length()
args.getLength()
第20题:
Change line 2 to: public int a;
Change line 2 to: protected int a;
Change line 13 to: public Sub() { this(5); }
Change line 13 to: public Sub() { super(5); }
Change line 13 to: public Sub() { super(a); }
第21题:
A
B
C
D
E
F
第22题:
Point p = Line.getPoint();
Line.Point p = Line.getPoint();
Point p = (new Line()).getPoint();
Line.Point p = (new Line()).getPoint();
第23题:
int foo() { /* more code here */ }
void foo() { /* more code here */ }
public void foo() { /* more code here */ }
private void foo() { /* more code here */ }
protected void foo() { /* more code here */ }
第24题:
Compilation fails.
The code compiles and the output is 2.
If lines 16, 17 and 18 were removed, compilation would fail.
If lines 24, 25 and 26 were removed, compilation would fail.
If lines 16, 17 and 18 were removed, the code would compile and the output would be 2.
If lines 24, 25 and 26 were removed, the code would compile and the output would be 1.